Filter material support



July 19, 19 0 H. TIETZE ETAL 2,945,556

FILTER MATERIAL SUPPORT Original Filed Nov 30, 1954 INVENTORJ Hermann Tz'efze Gerhard Siampe d TZTTO EYJ United States Patent 2,945,556 FILTERMATERIAL SUPPORT Hermann Tietze and Gerhard Stampe, Lubeck, Germany,assignors to Otto Heinrich Drager, Lubeck, Germany 4 Claims. (Cl.183-49) This invention relates to supports for filter material.

Filters must be constructed so that the loose granular filter materialcannot escape through the lower filter opening, while at the same timethe opening and filter material must be such as to olier the leastresistance to the passage of air. Generally, screens, grates, and thelike, are used forthe support, a layer of relatively coarse materialbeing first placed on the support, and then layers of successivelysmaller granules are placed in the filter until finally the filtermaterial itself can be applied without falling through the lower layers.

An object of this invention is to produce a support which offers littleresistance to the passage of air, and which can support the filtermaterial without using layers of coarse material. Another object of theinvention is to improve upon the means for collecting filtered air fromout of the filter. In general, these objects are obtained by forming agrate-like filter support, the grate bars having flanges at aninclination greater than the natural slope angle of the filter material.Consequently, the filter material can rest directly on the grate withoutpassing therethrough. Air ducts are connected into the space beneath thesupport or at the sides of the support for removing the filtered air.

The means by which the objects of the invention are obtained aredisclosed more fully with reference to the accompanying drawings, inwhich:

Figure 1 is a perspective view or a filter material support according tothis invention;

Figure 2 is a cross-sectional view taken on the line 2-2 of Figure 1;

Figure 3 is a side view of a further form of a filter support; and

Figure 4 is a cross-sectional view on the line 4-4 of Figure 3.

In Figures 1 and 2 the filter support is composed of tiers of invertedU-shaped strips 100. The tiers of the supporting strips are, arrangedparallel to each other. At one end they are connected to a collectingoutlet duct 102, and at the other end they are attached to a supportingsheet 104. Filter material, which is poured or otherwise deposited onthe tiers of supporting strips, is prevented from filling the spacebetween the strips 100 because of the natural slope angle of thematerial with respect to the angles of the strips. Outlet duet 102 isprovided with pipe fittings 106 and 108, either of which may be. used.In the event that connection 106 is used, connection 108 is closed offby a cover 110. Air passes through the filter as indicated by the arrowsin Figure 2.

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In Figures 3 and 4 the filter support again consists principally ofinverted V-shaped strips 120. Collecting duct 122 has a plurality ofhorizontally extending V-shaped flanges '124, one for each supportingstrip, with openings into duct 122 beneath said flanges. At each end ofeach strip are downwardly extending flanges 128 which serve as legs. Atone end of the strips these legs rest over flanges 124. At the other endof the strips the legs are nested to hold the strips in superimposedspaced relation. This nesting is facilitated by the angle of theshoulder-like flanges 130 on each strip, upon which rests the leg 128 ofthe superimposed strip. The construction shown in Figures 1 to 4 permitsthe easy shipment of the filter support in a dis assembled form fromwhich itcan be easily erected. The particular embodiment shown inFigures 3 and 4 has the added advantage that it is not aiiected byground vibrations.

The supports of this invention may be constructed of sheet metal butthey may also be made of ceramic, clay, or burnt clay, or the like, toform partial resistance to corrosion which would be particularlysuitable for sand filters used for air defense purposes.

This application is a division of the parent application SerialNo."472,082, filed Nov. 30, 1954, now abancloned.

Having now described the means by which the objects of the invention areobtained, we claim:

1. A filter material support comprising inverted V-shaped stripsvertically spaced from each other to form open air passages betweenadjacent strips and arranged in tiers with a plurality of tiersassembled in parallel rows, an outlet air duct common to said tiers andhaving openings communicating with said air passages, connecting meansfor supporting one end or each of said strips on said duct, and legmeans joined to the opposite ends of said strips.

2. A filter material support as in claim 1, said leg means comprisinglegs attached to each strip and resting upon a lower strip forseparating the strips in each tier.

3. A filter material support as in claim 2, further com prisingshoulder-like flanges on each strip forming a support for the leg of asuperimposed strip.

4. A filter material support as in claim 1, said leg means comprising asupporting sheet common to each oi said strips.

References Cited in the file of this patent UNITED STATES PATENTS

